which gas do burning substances react with
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oxygen
Complete combustion
Fuels are substances that react with oxygen to release useful energy. Most of the energy is released as heat, but light energy is also released. About 21 per cent of air is oxygen. When a fuel burns in plenty of air, it receives enough oxygen for complete combustion.
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oxygen
Air or oxygen which helps in burning is called supporter of combustion and the chemical reaction which takes place with the release of heat and light energy is called combustion. A chemical process in which a substance reacts with oxygen to give off heat is called combustion.
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